Yellow vat dye.



UNITED STATES PATENT 'orrion. nn'rn' 'a nbrmmennus AND HEINRICH von nmsnacn, or MANNHEIM, GERMANY,

ASSIGNOBS T0 BADISCHE ANILIN & SODA FABRIK, 0F LUDWIGSHAFEN-ON-THE- RHINE, GERMANY, A. CORPORATION OF GEBM YELLOW vast DYE.

No Drawing.

Specification of Letters Patent.

Application filed November 3, 1911. Serial No. 658,388.

' Patented Fee. 27, 1912.

Yellow Vat Dye, of which the following isa specification.

Our invention relates to new colorin matters which we regard as 'dianthraqu1- none-thioxa'nthones of a constitution corresponding to the formula where A represents an anthraquinone residue, either substituted or not.

We caniprepare the simplest representative of our new coloring matters by first treating 1-chlor-anthraquinone-2-carboxylic acid with beta-mercapto-anthraquinone and then treating the product with a condensing agent such, for instance, as concentrated sulfuric acid, until a thioxanthone ring is formed.

Ournew coloring matters consist, when dry, of yellow to brownish yellow powders and, in the'pure state, the simplest representative has a percentage composition corresponding to the formula They yield red-brown solutions in concentrated sulfuric acid, green-blue to blueblack vats in alkaline hydrosulfite solution, and dye cotton from these vats golden yellow shades of excellent fastness against the action of chlorin and light;

The following example will serve to illustrate further the nature of this invention,

which, however, is not confined to this exam 1e. The parts are by weight. Boil toget er, for about 8 hours, in a reflux apparatus while excluding air, 29 parts of 1- chlor-anthraquinone-2-carboxylic acid, 22 parts of beta-mercapto-anthraquinone, 12 parts of caustic potash and300 parts of water. Then filter, acidify the filtrate with dilute acetic acid, filter oil the beta-thio-anthraquinonyl l-anthraquinone- Q-carboxylic acid, and wash and dry it. It is a yellow powder-which yields a violet-red solution in concentrated sulfuric acid. Heat together, for 1 hour, on the water-bath, 10 parts of beta-thio-anthraquinonyl-l-anthraquinone-Q-carboxylic acid produced. as above and 100 parts of concentrated sulfuric acid. Pour the reaction mixture into water and extract the coloring matter which separates out with boiling dilute caustic soda solution. It consists ofa brownish yellow powder which, if desired, can be recrystallized from organic solvents of high boiling point. It yields a red brown solution in concentrated sulfuric acid and dyes cotton from the dull green-blue hydrosulfite vat golden yellow f shades.

Now what we claim is 1. The new coloring matters being dianthraquinone-thioxanthones, which consist, when dry, of yellow. to brownish yellow powders which yield red-brown solutions in concentrated sulfuric acid, green-blue to blue-black vats with alkaline hydrosulfite, and which dye cotton from these vats golden yellow shades of excellent fastness against the action of light and chlorin. 2. The new vat coloring matter which possesses a percentage composition corresponding to the formula which coloring matter consists, when dry,

of a brownish yellow powder which yields 7 a red-brown solution in concentrated sulset our hands in the presen ce'o f two sub- 7 furic acid, a dull green-blue vat in alkaline scribing witnesses.

hydrosulfite solution, and which dyes cotton ARTHUR LUTTRINGHAUS. from this vat golden yellow shades of ex- HEINRICH VON DIESBACH. 5 cellent fastness against the action of ehlorin Witnesses;

and light. J. ALEQ. LLOYD In testimony whereof we have hereunto I JOSEPH Pmmrmz. 

